Wild Thumper 6WD & Encoders

Hi all!

I'm the owner of Wild Thumper 6WD without encoders. It's really hard to get WT 6WD with encoders or motors for that platform with encoders at the place I live in. So I have to solve this problem in different way. Could you help me with my questions?

1) In basic model of 6WD with encoders on which axis encoders are installed?

2) Does it make sense to put encoders on all six wheels?

3) Are there any other encoders (not from Dagu) that are compatible with 6WD?

4) Are there any home-made solutions that will be good for 6WD?

Many thanks in advance

Best regards